<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告 -->
        <el-alert
            title="注意：只允许三级分类设置相关参数"
            type="warning" :closable="false" show-icon>
        </el-alert>
        <!-- 商品分类 -->
        <el-row>
            <el-col>
                <span>选择商品分类</span>
                <!-- 级联选择 -->
                <el-cascader
                    v-model="selectedCateKeys"
                    :options="cateList"
                    :props="cateProps"
                    @change="handleChange"
                    width="100%">
                </el-cascader>
            </el-col>
        </el-row>
        <!-- Tab页签区 -->
        <el-tabs v-model="activeName" @tab-click="handleClick">
            <!-- 添加动态参数面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled='isBtnDisable' @click="addDialogVisible=true" >添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="mantTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable>{{item}}</el-tag>
                            <!--输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <!-- 参数名称 -->
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <!-- 操作 -->
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled='isBtnDisable' @click="addDialogVisible=true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable>{{item}}</el-tag>
                            <!--输入文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <!-- 参数名称 -->
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <!-- 操作 -->
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>

    </el-card>
    <!-- 添加对话框 -->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close='addDialogClosed'
        >
        <!-- 添加参数对话框 -->
        <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
            <el-form-item :label="labelText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>
    <!-- 修改对话框 -->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close='editDialogClosed'
        >
        <!-- 修改参数对话框 -->
        <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRules">
            <el-form-item :label="labelText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            cateList:[],
            //级联选择框的配置对象
            cateProps:{
                expandTrigger: 'hover',
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            //被激活页签名称
            activeName:'many',
            //动态参数数据
            mantTableData:[],
            //静态属性数据
            onlyTableData:[],
            //控制对话框
            addDialogVisible:false,
            //添加参数表单数据对象
            addForm:{
                attr_name:''
            },
            //验证规则
            addFormRules:{
                attr_name:[
                    {required:true ,message:'请输入参数',trigger:'blur'}
                ]
            },
            //控制修改对话框
            editDialogVisible:false,
            //修改表单数据对象
            editForm:{},
            //修改表单验证规则
            editFormRules:{
                attr_name:[
                    {required:true ,message:'请输入参数',trigger:'blur'}
                ]
            },
            //控制按钮与文本框的显示
            inputVisible:false,
            //文本框中输入的内容
            inputValue:''
        }
    },
    created() {
        this.getCateList()
    },
    computed:{
        //如果按钮需要被禁用则返回true
        isBtnDisable(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            else
            {
                return false
            }
        },
        //当前选中分类的ID
        cateID(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        },
        //动态计算label文本
        labelText(){
            if(this.activeName==='many'){
                return '添加参数'
            }
            return '添加属性'
        }
    },
    methods: {
        //获取列表数据
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200)
                return this.$message.error('获取商品失败')
            
            this.cateList=res.data
        },
        //级联选择框选中项目变化触发
        handleChange(){
           this.getParamsData()

        },
        //获取参数列表数据
        async getParamsData(){
             //如果不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.mantTableData=[]
                this.onlyTableData=[]
                return 
            }
            //根据所选分类ID和当前所处面板获取对应的参数
            const{data:res} =await this.$http.get(`categories/${this.cateID}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200)
                return this.$message.error('获取参数列表失败')
            
            res.data.forEach(item =>{
                item.attr_vals=item.attr_vals?
                item.attr_vals=item.attr_vals.split(''):[]
                //控制文本框的显示与隐藏
                item.inputVisible=false
                //文本框输入的值
                item.inputValue=''
            })
            console.log(res.data)
            if(this.activeName==='many'){
                this.mantTableData=res.data
            }
            else{
                this.onlyTableData=res.data
            }
        },
        //tab页签点击事件处理函数
        handleClick(){
            this.getParamsData()
        },
        //监听对话框关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                
                if(!valid) return 
                const {data:res} = await this.$http.post(`categories/${this.cateID}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201)
                    return this.$message.error('添加参数失败')
                
                this.$message.success('添加参数成功')
                this.addDialogVisible=false
                this.getParamsData()
                })
        },
        //点击按钮展示修改对话框
        async showEditDialog(attr_id){
            //查询参数信息
            const{data:res}=await this.$http.get(`categories/${this.cateID}/attributes/${attr_id}`,
            {params:{attr_sel:this.activeName}})
            if(res.meta.status!==200)
                return this.$message.error('获取商品失败')
            
            this.editForm=res.data
            console.log(this.editForm)
            this.editDialogVisible=true
        },
        //监听修改对话框关闭事件
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return 
                const {data:res} = await this.$http.put(`categories/${this.cateID}/attributes/${this.editForm.attr_id}`,
                {
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                console.log(res)
                if(res.meta.status!==200)
                return this.$message.error('修改参数失败')

                this.$message.success('修改参数成功')
                this.editDialogVisible=false
                this.getParamsData()
            })
        },
        //点击按钮删除参数
        async removeParams(attr_id){
            const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)
            if(confirmResult !=='confirm'){
                return this.$message.info('已经取消删除')
            }

            const {data:res}= await this.$http.delete(`categories/${this.cateID}/attributes/${attr_id}`)
            if(res.meta.status !==200) return this.$message.error('删除参数失败')
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        //展示文本框
        showInput(row){
            row.inputVisible=true
            this.$nextTick(function(){
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //文本框失去焦点
        async handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return 
            }
            //如果没有return则证明需要后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            //将数据串如数据库中
            const{data:res}=await this.$http.put(`categories/${this.cateID}/attributes/${row.attr_id}`,
            {attr_name:row.attr_name,attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(' ')})
            if(res.meta.status!==200)
                return this.$message.error('修改参数失败')
            this.$message.success('修改参数成功')
        },
    },
}
</script>

<style lang='less' scoped>
.el-alert{
    margin-bottom: 15px;
}
.input-new-tag{
    width: 120px;
}
</style>
